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參數(shù)資料
| 型號： | TC818ACBU |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大小： | 528K |
| 代理商： | TC818ACBU |
TC818A
DS21475C-page 6
2005 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
3.1
Analog-to-Digital Converter (ADC)
The TC818A includes an integrating ADC with auto-
ranging resolution of 2000 counts and manual range
resolution of 3000 counts. Figure 3-1 shows a simpli-
fied schematic of the analog section. In Auto-Ranging
mode, internal logic will adjust the input voltage or
ohms attenuators so that measurements will always be
made in the appropriate range.
Measurement ranges, logic control inputs, 3-1/2 digit
LCD formatting, and other features are identical to the
TC818A auto-ranging A/D converter. However, the
TC818A is not pin compatible with, and is not a replace-
ment for, the TC818A.
A display annunciator output (ANNUNC) can be used
to customize the LCD. ANNUNC is a square wave at
the backplane frequency. Connecting an annunciator
segment to the ANNUNC driver turns the segment on;
connecting the segment to its backplane turns it off.
37
ΩR3
Standard resistor connection for 20k
Ω full scale range.
38
ΩR4
Standard resistor connection for 200k
Ω full scale range.
39
ΩR5
Standard resistor connection for 2000k
Ω full scale.
40
VR3
Voltage measurement ÷ 100 attenuator.
41
VR2
Voltage measurement ÷ 10 attenuator.
42
VR5
Voltage measurement ÷ 10,000 attenuator.
43
VR4
Voltage measurement ÷ 1000 attenuator.
44
VI
Unknown voltage input ÷ attenuator.
45
II
Unknown current input.
46
ACVL
Low output of AC-to-DC converter.
47
CI
Integrator capacitor connection. Nominally 0.1
μF. (Must have low dielectric absorption.
Polypropylene dielectric suggested.)
48
NC
No connection.
49
CAZ
Auto-zero capacitor connection. Nominally 0.1
μF.
50
RX
Unknown resistance input.
51
CFI
Input filter connection.
52
ADI
Negative input of internal AC-to-DC operational amplifier.
53
ADO
Output of internal AC-to-DC operational amplifier.
54
R
ΩBUF
Active buffer output for resistance measurement. Integration resistor connection.
Nominally 220k
Ω.
55
RVIBUF
Active buffer output for voltage and current measurement. Integration resistor connection.
Nominally 15k
Ω.
56
ACVH
Positive output of AC-to-DC converter.
57
VSS
Negative supply connection. Connect to negative terminal of 9V battery.
58
DGND
Internal logic digital ground. Ground connection for the logic "0" level.
Nominally 4.7V below VCC.
59
RANGE
Input to set manual operation and change ranges.
60
HOLD
Input to hold display. Connect to DGND to "FREEZE" display.
61
-MEM
Input to enter Memory Measurement mode for relative measurements. The two LSDs are
stored and subtracted from future measurements.
62
DC(
Ω)/
AC(LO
Ω)
Input that selects AC or DC option during voltage/current measurements. For resistance
measurements, the ohms or low power (voltage) ohms option can be selected.
63
I
Input to select measurement. Connect to logic "0" (digital ground) for current measurement.
64
NC
No connection.
TABLE 2-1:
PIN FUNCTION TABLE (CONTINUED)
Pin Number
(64-Pin PQFP)
Symbol
Description
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC818ACBUTR | 1-CH DUAL-SLOPE ADC, PQFP64 |
| TC818DCOP | CONVERTER SUBSYSTEM ADC, PARALLEL ACCESS, PDSO20 |
| TC818ACBQ | CONVERTER SUBSYSTEM ADC, PARALLEL ACCESS, PQFP60 |
| TC820C/LW | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| TC820C/PL | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC-819-SC | 制造商:Thomas & Betts 功能描述: |
| TC820 | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE |
| TC820CKW | 功能描述:LCD 驅(qū)動器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC820CKW713 | 功能描述:LCD 驅(qū)動器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC820CLW | 功能描述:LCD 驅(qū)動器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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